Abstract
As the basic circuit of the optoelectronic stabilized platform, the performance index of the speed control loop is affected by friction coefficient of the system. Dynamics equation of single-axis servo mechanism and the frequency characteristic index of electromechanical system model are analyzed theoretically, and then the influence of friction on the frequency characteristic of the system is studied. The influence of friction on the servo performance of the system is directly analyzed through simulation analysis. The results show that changing the Coulomb friction not only affects the low frequency amplitude-frequency characteristics of the system, but also leads the phase of the middle frequency band with the increase of Coulomb friction. The effect of the viscous friction coefficient on the performance of the system is mainly reflected in the adjustment of the resonance peak. The effect of changing the viscous friction coefficient is equivalent to that of changing the damping ratio of the system.